Hi, ya I am also considerig these speakers, my interest is in the 12vs they don't have them in stock at this time, I am now using just 4 k.c 60 rolands,I just started doing gigs, and to my surprise was offered several jobs I also entertain for seniors,I think they are quite hip, they like the 60 and 70 hits,twist etc. they get out there and rock, I need 4 speakers as I use output 1&2 for base & drums, what is the difference in a keyboard powered speaker verses just a powered speaker?the price is right on these and every one seems to like them/////Paula